docs: def serialize(self, data):
          """
          Write a sequence of hazard curves to the specified file.
  
          :param data:
              Iterable of hazard curve data. Each datum must be an object with
              the following attributes:
  
              * poes: A list of probability of exceedence values (floats).
              * location: An object representing the location of the curve; must
                have `x` and `y` to represent lon and lat, respectively.
          """
          with open(self.dest, 'wb') as fh:
              root = et.Element('nrml')
              self.add_hazard_curves(root, self.metadata, data)
              nrml.write(list(root), fh)